<template>
    <div class="upload-container">
        <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" @click=" dialogVisible=true">上传图片
        </el-button>
        <el-dialog :visible.sync="dialogVisible">
            <el-upload 
                :multiple="true" 
                :file-list="fileList" 
                :show-file-list="true" 
                :on-remove="handleRemove" 
                :on-success="handleSuccess" 
                :before-upload="beforeUpload" 
                :auto-upload="true"
                class="editor-slide-upload" 
                action=""
                :http-request="handleOssUpload" 
                list-type="picture-card">
                <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
            <el-button @click="dialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="handleSubmit">确 定</el-button>
        </el-dialog>
    </div>
</template>

<script>
import { getRand } from "@/libs/utils"
import OSS from 'ali-oss'
import config from '@/config'

export default {
    name: "EditorSlideUpload",
    props: {
        color: {
            type: String,
            default: "#1890ff"
        }
    },
    data() {
        return {
            dialogVisible: false,
            listObj: {},
            fileList: [],
            client: null,
        };
    },
    mounted () {
        this.$nextTick(function () {
            //初始化Aliyun OSS
            this.client = new OSS(config.Aliyun.oss);
        })
    },
    methods: {
        handleOssUpload(option) { //阿里云OSS文件上传
            let self = this
            try {
                this.client.multipartUpload(getRand(), option.file, { 
                    progress: async function (p, checkpoint) {
                        console.log(p * 100);
                    },
                    mime: 'image/jpeg'
                }).then(result => {
                    if(result.res.statusCode === 200) {
                        //回调文件上传成功函数
                        option.onSuccess(result.res.requestUrls[0].split('?')[0])

                        this.$notify({ title: '提示', message: `文件上传成功，请保存生效。`, type: 'success', dangerouslyUseHTMLString: true });
                    } else {
                        this.$notify({ title: '提示', message: '文件上传失败', type: 'error' });
                    }
                })
            } catch(e){
                console.log(e);
            }
        },
        checkAllSuccess() {
            return Object.keys(this.listObj).every(
                item => this.listObj[item].hasSuccess
            );
        },
        handleSubmit() {
            const arr = Object.keys(this.listObj).map(v => this.listObj[v]);
            if (!this.checkAllSuccess()) {
                this.$message(
                    "请等待所有图片上传成功 或 出现了网络问题，请刷新页面重新上传！"
                );
                return;
            }
            this.$emit("successCBK", arr);
            this.listObj = {};
            this.fileList = [];
            this.dialogVisible = false;
        },
        handleSuccess(response, file) {
            const uid = file.uid;
            const objKeyArr = Object.keys(this.listObj);
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    this.listObj[objKeyArr[i]].url = file.response;
                    this.listObj[objKeyArr[i]].hasSuccess = true;
                    return;
                }
            }
        },
        handleRemove(file) {
            const uid = file.uid;
            const objKeyArr = Object.keys(this.listObj);
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    delete this.listObj[objKeyArr[i]];
                    return;
                }
            }
        },
        beforeUpload(file) {
            const isJPG = file.type === 'image/jpeg';

            if (!isJPG) {
                this.$message.error('上传头像图片只能是 JPG 格式!');
                return false
            } else {
                const _self = this;
                const _URL = window.URL || window.webkitURL;
                const fileName = file.uid;
                this.listObj[fileName] = {};
                return new Promise((resolve, reject) => {
                    const img = new Image();
                    img.src = _URL.createObjectURL(file);
                    img.onload = function() {
                        _self.listObj[fileName] = {
                            hasSuccess: false,
                            uid: file.uid,
                            width: this.width,
                            height: this.height
                        };
                    };
                    resolve(true);
                });
            }
        }
    }
};
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.editor-slide-upload {
    margin-bottom: 20px;
    /deep/ .el-upload--picture-card {
        width: 100%;
    }
}
</style>
